Onak arrives in Namimori at the same time as the other fake junior high students. He attends to Namimori Junior High, pretending to be junior high student, when he in reality is 17 years old. When tasting sushi at the Takesushi sushi store, he meets Yamamoto Takeshi and a bond of friendship is starting to grow between them.

Vate is Onak's oldest brother, as well as his former boss. Onak and Vate are stated to have a similar grin, but their personalities are different; Vate being of a cheerfree nature while Onak is often calm.